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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Test method for empirically determining inertial properties of manual wheelchairs Matthew R. Eicholtz, MS; Jayme J. Caspall, MS; Phuc V. Dao, MS; Stephen Sprigle, PhD, PT; Al Ferri, PhD

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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Study Aim – Design and study a method for empirically measuring inertia properties of manual wheelchairs. Relevance – Results will improve and generate new studies on wheelchair performance, especially during turning maneuvers, in which inertia is important.

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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Methods – Used iMachine for tests. Spring-loaded turntable for measuring inertial properties of irregularly shaped rigid bodies. – Calculated wheelchair mass and center of mass from static force measurements using load cells. Used Newton-Euler approach. – Determined moment of inertia about vertical axis from natural frequency of system in simple harmonic motion. – Calibrated iMachine to eliminate effects of platform components on measurement error.

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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Results Average relative error: – Mass = 0.76% – Center of mass x-axis = 0.89% y-axis = 1.99% Resolution of moment of inertia calculation depends on ratio of test piece inertia to system inertia: ratio indicates = measurement accuracy Gage repeatability and reproducibility test with 3 manual wheelchairs: – Each completed 3 tests by 3 different operators. – 99% of inertia variance caused by wheelchair differences.

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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Results Relative error vs inertia ratio (ratio of test piece inertia to total inertia of test piece and turntable).

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This article and any supplementary material should be cited as follows: Eicholtz MR, Caspall JJ, Dao PV, Sprigle S, Ferri A. Test method for empirically determining inertial properties of manual wheelchairs. J Rehabil Res Dev. 2012;49(1):51–62. http://dx.doi.org/10.1682/JRRD.2011.03.0045 Slideshow Project DOI:10.1682/JRRD.2011.03.0045JSP Conclusions iMachine measurement system operation is acceptable for both inertia and mass measurement using criteria from Automobile Industry Action Group.

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